<view style="padding-top:10rpx">
    <canvas canvasId="myCanvas" class="myCanvas" style="height:300px;width:100%;"></canvas>
    <view class="padding flex flex-direction">
        <button bind:tap="savePic" class="cu-btn bg-cyan shadow lg round">保存至相册</button>
    </view>
    <adComponent  wx:if="{{ad}}" ad="{{ad}}"/>
</view>
